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-rw-r--r--src/libmsc/gsm_04_11_gsup.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libmsc/gsm_04_11_gsup.c b/src/libmsc/gsm_04_11_gsup.c
index a24c617e7..cf9d11d2e 100644
--- a/src/libmsc/gsm_04_11_gsup.c
+++ b/src/libmsc/gsm_04_11_gsup.c
@@ -315,6 +315,7 @@ int gsm411_gsup_rx(struct gsup_client_mux *gcm, void *data, const struct osmo_gs
default:
LOGP(DMM, LOGL_ERROR, "No handler found for %s, dropping message...\n",
osmo_gsup_message_type_name(gsup_msg->message_type));
+ gsup_client_mux_tx_error_reply(gcm, gsup_msg, GMM_CAUSE_MSGT_NOTEXIST_NOTIMPL);
rc = -GMM_CAUSE_MSGT_NOTEXIST_NOTIMPL;
}